<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>

<body>
  <div id="root">
    <!-- app -->
    <script crossorigin src="https://unpkg.com/react@16.3.2/umd/react.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@16.3.2/umd/react-dom.production.min.js"></script>
  </div>

</body>

</html>